Sleep sound machine



FIG. 1 is a top view of a sleep sound machine, showing the claimed design;

FIG. 2 is a right-side view thereof;

FIG. 3 is a front-side view thereof;

FIG. 4 is a rear-side view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a cross-sectional view taken in the direction of line 7-7 of FIG. 1

FIG. 8 is a bottom-perspective view thereof; and,

FIG. 9 is a top-perspective view of thereof. 

CLAIM The ornamental design for a sleep sound machine, as shown. 